Disease analysis problem in database

Question

hy I am facing a problem of generating reports of diffenent diseases based on different criteria my problem is that I have four tables
Patients (patient_id,name,gender,DOB) with data
(1,jon,male,12-FEB-1980)
(2,mical,male,12-FEB-1950)
(3,sunita,female,12-FEB-1970)
(4,shakira,female,12-FEB-1960)
visits(visit_id,patient_id,visit_date) with data
(1,1,12-FEB-2011)
(2,1,12-FEB-2001)
(3,1,12-FEB-2010)
(4,2,12-FEB-2011)
(5,2,12-FEB-2009)
(5,3,12-FEB-2008)
(6,3,12-FEB-2007)
(7,4,12-FEB-2011)
patient_disease_history(history_id,disease_id,visit_id) with data
(1,F00,1)
(2,F00,1)
(3,F01,1)
(4,F01,1)
(5,F02,1)
(6,F00,2)
(7,F01,2)
(8,F01.0,3)
(9,F02.0,3)
(10,F00.1,4)
(11,F00,4)
(12,F04,5)
(13,F04,5)
(14,F03.0,6)
(15,F03.1,6)
(16,F03.2,7)
(17,F00.0,7)
(18,F02.0,7)
(19,F03.1,7)
diseases(disease_id,title,base_category) HAVING data like
(F001,Cancer,'')
(F00,brest cancer,F001)
(F00.0,left brest cancer,F00)
(F00.1,right brest cancer,F00)
(F01,chest cancer,F001)
(F01.0,inner chest cancer,F01)
(F01.1,outer cancer,F01)
(F02,leg cancer,F001)
(F02.0,left lef cancer,F02)
(F02.2,right lef cancer,F02)
(F03,arm cancer,F001)
(F03.0,left arm cancer,F03)
(F03.1,right arm cancer,F03)
(F03.2,center finger cancer,F03)
(F04, ear cancer,F001)
(F002, TB,'')
(F003, AIDS,'')
1) Now my first requirement is to find total no of patients under F001 result should be collection of all the diseases under that disease
2) second find total no of male PATIENTS under F001
3) find total no of patients under F001 from visit_date 1-FEB-1949 to 1-FEB-1990
4) find total no of female patients under F001 from visit_date 1-FEB-1949 to 1-FEB-1990
5) find total no of patients under F03 from visit_date 1-FEB-1949 to 1-FEB-1990 whose DOB is 12-FEB-1980
solve these problems either using sub queries or hierarical queries
only write queries with results of each query

Answer 1

Homework?
Anyway you should ask this in the database forum {forum:id=75}
Timo